code: def test_empty_string(self):
      keyword_processor = KeywordProcessor()
      keyword_dict = {
          "java": "java_2e",
          "product management": "product manager",
      }
      self.assertEqual(
          keyword_processor.extract_keywords(""),
          [],
          "new_sentence don't match the expected result",
      )
      self.assertEqual(
          keyword_processor.replace_keywords(""),
          "",
          "new_sentence don't match the expected result",
      )
  
file_path: flashtext/test/test_kp_exceptions.py
imports: from collections import defaultdict
  from flashtext import KeywordProcessor
  import logging
  import unittest
  import pytest
  import json
  import re
label_desc: Use image node_id 9 for calling the TestKPExceptions obj's underlying member method code with example usage: obj.test_empty_string() without return types